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Roasting is a process of heating a sulfide ore to a high temperature in the presence of air. It is a step in the processing of certain ores . More specifically, roasting is often a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s).
The main steps of magnetizing roasting in shaft furnace include: Charge preparation: Mix iron ore with reducing agent in a certain proportion. Heating: The charge is added from the top of the shaft furnace and heated layer by layer as it falls to a roasting temperature (usually between 700 °C and 900 °C).
Sometimes, temperature and gas conditions can be maintained such that a mixed sulfide feed (for instance a feed containing both copper sulfide and iron sulfide) reacts such that one metal forms a sulfate and the other forms an oxide, the process is known as "selective roasting" or "selective sulfation".
Calcination is thermal treatment of a solid chemical compound (e.g. mixed carbonate ores) whereby the compound is raised to high temperature without melting under restricted supply of ambient oxygen (i.e. gaseous O 2 fraction of air), generally for the purpose of removing impurities or volatile substances and/or to incur thermal decomposition.
Add the potato, carrot, shallot and garlic cloves, and sauté over medium heat. Add the thyme and bay leaf, cover, then cook, stirring regularly, for 15 minutes. Season with salt and pepper.
A low-temperature oven, 95 to 160 °C (200 to 320 °F), is best when cooking with large cuts of meat, turkey and whole chickens. [2] This is not technically roasting temperature, but it is called slow-roasting. The benefit of slow-roasting an item is less moisture loss and a more tender product.
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